Portable screw-elevator



Patented Feb.

"J.T..AYBRS. PORTABLE SCREW BLEVATOR.

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' UNITED 'STATES PATisrvVrY OFFICE.

JOHN T. AYERS, OF ELMIRA, NEW YORK.

PORTABLE SCREW-ELEVATOR.

SPECIFICATION forming part of LettersPatent No. 514,299, dated February6, 1894.

Application led May 29, 1893.- Serial No. 475,906. (No model.)

/ To all whom it may concern..-

Be it known that I, JOHN T. AYERS, a citizen of the United States,residing at Elmira, in the county of Ghemung and State of New York, haveinvented certain new and useful Improvements in PortableScrew-Elevators;

y and I do hereby declare the following to he a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which 'it appertains to make and use the same.

This invention relates to an improvement in portable screw elevators.

The object is to provide a strong and efcient mechanism which can beeasily moved about from one place to another and employed efficientlyfor the purpose of lifting heavyarticles such as beer kegs or barrels,flour barrels, &c.

Theinvention is intended to be adapted for a great variety of uses. Y

It consists therefore essentially in the construction, arrangement andcombination of parts substantially as will be hereinafter described andthen more particularly pointed out inthe following claim.

In the annexed drawings illustrating my invention: Figure lis a frontperspective view of my improvedportable screw elevator. Fig. 2 is alongitudinal vertical section of the same. Fig. 3 is a transversevertical section. Fig. 4 is a detailed horizontal cross section on theline w a; of Fig. 3. Fig. 5 is a partial side ele- .vation showing amodification in the arrangement of the parts of the actuating mechanism.

Similar letters of reference designate correponding parts throughout allthe different iigures of the drawings. p

The design of this invention is to provide an elevator having a strengthand capacity equal to those which are ordinarily made as fixedstructures in buildings, &c., but yet which may be easily moved aboutfrom place to place so as to be readily applied for use at any desiredpoint, its several mechanical parts being supported upon a stout truckof any suitable size and construction. A designates the platform of thissupporting truck. B denotes the wheels secured on'the horizontal shaftsb b which are suitably journaled beneath the platform A. The wheels Bare preferably quite small in size. I do not desire to be restricted toany particular construction however for this truck, reserving theliberty of making the platform A in any desired manner and also ofemploying any kind of wheels andarranging them in any preferred style,it

being only desirable that the truck shall be so made that it can beeasily rolled about from placeto place.

On the platform A are supported two uprights C C of any desired heightand size, being of course strong and rigid and a sufficient .distanceapart to allow the elevator vplatform K to be arranged between them insuch a manner that it can easily be lifted and lowered. The u-prights CC are sustained in their position by means preferably of iron braces asshown in the drawings. These posts or uprights C C are usually maderectangular and hollow so as to provide the inner grooves orlongitudinal recesses c c. Within these vertical longitudinal recesses cc are located the operating screws E E, whose upper ends are journaledin the fixed blocks E and whose lower ends e e are supported revolublyin the steps o. a or bearing plates, which are placed in the platform A.Thus it will be seen that the lower ends of the operating screws E E aresupported in such a manner as to bear the weight of the screws and yetto permitan easy rotation thereof in neatly arranged bearings. The.upper ends of the uprights C C are connected together by means of ahorizontal tie piece D, the ends of-which are bent at right angles sothat they can lie ouside of the uprights C C in contact with the outerfaces thereof, as shown in Figs. l and 2, said ends being slotted at d dand through these slots pass the-adjustable bolts D D which are used for`the purpose of securely fastening the tie rod to the uprights. It willbe observed moreover therefore that this tie piece is adjustablevertically on account of the arrangement of slots and bolts so that itshorizontal portion may be lifted a shortdistance above the extreme upperends of the uprights when desired for the purpose of permitting the loadof the elevator to be carried higher than would otherwise be possible ifthis tie piece were not thus made adjustable. Y

The operating screws E E are constructed in the ordinary manner with thespiral thread. Their lower ends e e which as we have seen already aresupported in the hardened plates a. a are provided with small horizontalbevel pinions e which are securely fastened thereto. These pinions emesh with vertical bevel pinions ff which are securely fixed on oppositeends of a horizontal shaft F, which is supported in bearings F F on thetruck platform A. Parallel to the shaft F is another shaft G which islikewise supported in bearings on the platform A. The shaft G isprovided near its middle point with a gear wheel I which engages anothergear wheel Il secured on the shaft F near its middle point. The shaft Gcarries at each end a pinion N located outside of the uprights C C. Onthe outer face of each of the uprights C is arranged a train of gears L,P and O which intermesh with each other and are supported on studs fixedin the uprights, all as is clearly shown in Figs. l and 2. The gears L Lare provided with crank handles M M by means of which they are rotated.The rotation of gear L obviously imparts motion to the gears P, O and N,which in turn rotate the shaft G and consequently the shaft F, which isgeared to the shaft G and this results in the rotation of the verticalscrew shafts E E. The platform K, of the elevator, is provided with nutsthrough which the screws E E pass and consequently the rotation of thescrews E E in one direction or the other, must result in the lifting orlowering of the elevator platform K after the usual manner of theoperation of screw elevators. k 7.: designate these nuts which belong tothe platform K and it will be obvious that they may be constructed,arranged and applied, in any desirable or preferred manner.

Sometimes I find it desirable to omit the gears O and P which connectthe gearsL and N, and substitute in Aplace of these gears O and P, achain Q, as is shown in Fig. 5. When this is done, I make the gears Land N after the manner of sprocket wheels, and the chain Q by passingaround these sprocket wheels, connects them and performs the samefunction as is performed in the construction shown in Fig. l by means ofthe intermediate gearing. The gears L L are situated at such a heightthat the crank handles M M which inanipulate them, may be convenientlyplaced for manipulation by a person standing near the elevator. Itherefore reserve the liberty of communicating motion from the gearsL Lto the shafts F and G in any desired manner, either by intermediategearing or by sprocket wheels and chains or by other suitableconnections.

A portable elevator constructed in the manner which I have justdescribed, will be found to be very strong and efficient and it canreadily be moved from place to place so as to be used wherever desired.On the platform A, I attach the rectangular guards .l J which arelocated alongside of the shafts F and G and which serve to prevent theelevator platform from descending into contact with said shafts andtheir gearing.

Numerous changes in the exact details of the construction, arrangementand combination of the several parts may be made without departing frommyinvention. Metallic plates or incasements for several of the woodensections of the apparatus may be employed and secured in place by boltsor in any other desired manner. I reserve the liberty therefore ofmaking many of these minor changes and of construetin g and applying theseveral parts in such a manner as to achieve the best re suits and makethe apparatus the most practical and eilicient in use.

Having thus described my invention, what I claim as new, and desi re tosecure by Letters Patent, is-

The combination of the uprights C C, the vertical screw shafts E Ehaving their lower ends e e supported in step bearings a ct, andcarrying bevel pinion e', the horizontal shaft F, having at each end apinionf engaging the adjacent pinion e and having atfits middle point agear Il, the parallel shaft G having a gear I which engages gear I-I andhaving at each end a pinion N, the gears L L, with their operatingcranks M M and suitable connections between the gears L L and thepinions N N, together with the platform K having nuts which are engagedby the vertical screw shafts E E, all substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOI-IN T. AYERS.

Witnesses:

M. Il. HURs'r, CHARLES S. DENIsoN.

